Secondary battery



(NOMOdel') W W GRISGOM.

SENDARY BATTERY.

Patented July 9, 1889.

UNITED STATES PATENT OEEICE.

VILLIAM W. GRISCOM, OF IIAVERFORD COLLEGE, PENNSYLVANIA, ASSIGNOR TO THE ELECTRICAL ACCUMULATOR COIWIPANY, OF NEW YORK.

SECON DARY BATTERY.

SPECIFICATION forming part of Letters Patent No. 406,489, dated July 9, 1889.

n Application flledApril l2, 1889. Serial No.306,921. (No model.)

.To all whom t may concern:

Be it known that I, IVILLIAM IV. GRISGOM, a citizen of the United States, and a resident of Haverford College, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Secondary Batteries, of which the following is a specification.

My invention is an improvement in secondary batteries.

The invention consists of an inclosing-cell having shoulders upon interior opposite sides,

' about midway the vertical height thereof,

combined with elements having projections upon opposite edges, midway the vertical height, which rest upon and are supported by the shoulders within and forming part of the cell. vI provide shoulders or projections near the upper edge for the purpose of supporting` a rigid cover of insulating material completely inclosing the cell, and in this cover I place one or more perforated buttons of hard rubber or some equally rigid material, to provide an escape for the accumulating gases and to serve as handles by which to lift the cover.

Heretofore an inclosing-cell has been provided having a separate support midway the vertical distance, upon which the elements of the battery, furnished with suitable projections upon opposite sides, have been rested. My invention differs from this, in that the supporting points or shoulders are formed out of and are'part of the cell itself. By this means I avoid displacement of the points of support when the electrolytic liquid is being placed in the cell. It is also old to furnish a cover with a vent-hole of a soft and yielding material, such vent-hole or perforation automatically closing when the pressure of gasl decreases.

The Ydistinguishing characteristic of this part of my invention consists in providingaa vent hole through the button, which also serves as [a handle and is sufficiently hard and rigid to avoid temporary closure of the vent-hole.

The accompanying drawings illustrate my invention. l

Figure l is a vertical section on the line 1 l, Fig. 2, of the cell, showing the element in position, with its projections resting upon the shoulders of the cell. Fig. 2 is a plan view, showing the cover and cell in section.

C is a cell of insulating material-as hard rubber-having shoulders S upon its interior, 5 5 at or about the central vertical distance thereof. The two elements, each formed of a series of interleaved plates, like P, are furnished with projections p p upon opposite edges near the centralvertical distance, which rest upon 6o and are supported by the shoulders S within the cell. y

B is a cover of insulating material-as hard rubber-tightly fitting the interior of the top' of the cell and resting upon projections m within the cell and near the top thereof. In this cover are located one or more buttons of hard rubber Z, having a perforation extend ing completely therethrough, like h. These buttons serve as handles by which to remove 7o the cover B, and the vent-holes h furnish a passage for the accumulating gases of the cell.

A cell constructed in this way occupies less Hoor-space and affords a means for supporting the elements free from the bottom of the cell in such a manner that one element may be freely removed without disturbing the other, to the end that it may be examined, repaired, or substituted. Each element is provided with a lug, as L, projecting from the cell 8o at or near a central point on opposite sides.

What I claim, and desire to secure by Let-w ters Patent, is

1. In a secondary battery, a cell of insulating material having projections formed in or upon its interior opposite walls and near the central vertical distance, in combination with two elements, each composed of a series of interleaved p arallel plates having projections upon opposite sides, near the central vertical 9o distance, resting upon or supported by said projections from the interior of the cell, whereby one element may be removed without disturbing the other, substantially as described. A

2. The combination, in an electric battery, of an inclosingcell of insulating material, having shoulders orprojections upon its opposite interior walls, near the upper edge thereof, a cover of insulating material resting 10o upon said projections and having one or'more rigid perforated handles, suitable elements or electrodes for said battery, and au electrolytic liquid, all arranged and operating substantially as and for the purpose described.

3. In an electric battery, the combination 5 of a hard-rubber nclosingcell having` proj ections upon interior opposite Walls, at or near the central vertical disi'ance and at or near Jche upper edge thereof, elements resting upon the first -nalned projections and supported 1o thereby, a hard-rubber @over resizing upon said second projections, and one or more perforated rigid buttons of hard rubber located in said cover, whereby Jche cover may be rclnoved and replaced and the accumulating gases may escape, all arranged substantially 15 as described.

Signed at New York city, iu the county of New York and Siate of New York, this 11th day of April, A. D. 1,889.

WILLIAM W. GRISCOM. XViimesses:

DANIEL E. DELAVAN, V. E. SCHAUMBURG. 

